[ci] Give the BK72xx clang-tidy environment the static allocation flag the real build has (#20764)

platformio.ini

@@ -599,6 +599,8 @@ build_flags =
     ${flags:clangtidy.build_flags}
     -DUSE_BK72XX
     -DUSE_LIBRETINY_VARIANT_BK7231N
+    ; The libretiny component adds this at code generation so FreeRTOSQueue can use xQueueCreateStatic
+    -DconfigSUPPORT_STATIC_ALLOCATION=1
 build_unflags =
     ${common.build_unflags}